The Append option in the File menu is used to append option in the File menu is used to append additional data sets to the current data set.
asymmetryve comparison reveals modest north-south asymmetries in a number of the data sets.
color lineisplay up to 64 independent data sets using different colors and/or line styles for each set.
correlation coefficients for combined data sets over all hours, months and stations are determined, together with the standard errors of estimates.
The boundary data for these data sets has been severely degraded.